Table 3-2. Self-Test

ARMY TM 5-6675-309-14

MARINE CORPS TM 08840A-14/1

Table 3-2. Self-Test

Test procedure

Normal indication

1. INPUT POWER TEST

Before connecting cable, ensure +28 volt power supply

is turned off

Observe correct polarity. Reversed polarity can damage

the PSTS

1a. Connect (see figure 3-2)

(1) Terminal lugs of cable W311 to +28V power

supply

(2) W311P1 to PSTS J5

(3) Digital voltmeter (DVM) to primery power

1b. Turn on DVM

1c. Set switches as follows:

SWITCH

SETTING

MODE

OVERLOAD

FUNCTION

PS +17V

REFERENCE

0VDC

SELF TEST

OFF

INPUT POWER - UUT

OFF

INPUT POWER - PSTS

OFF

POWER SUPPLY

VEHICLE SENSE

OFF

INTERLOCK

OFF

IMU OVERTEMP

OFF

FLAG

OFF

COMP PS

OFF

1d. Turn on +28V power supply. If OVERTEMP indi-

cator lights, check polarity of cable W311

TIME HOURS meter is operating by observation

1e. Set INPUT POWER PSTS to ON

of comma oscillation. Fan is operating

1f. Press POWER SUPPLY TEST SET ON switch-

POWER SUPPLY TEST SET ON switch-indica-

indicator to on

tor lights

1g. Set MODE switch to NO LOAD

DVM indicates +26 to +30V

1h. Connect DVM positive test lead to SELF TEST

+28V test jack and negative test lead to SELF

TEST PWR RTN test jack

1i. Connect DVM positive test lead to SELF TEST

DVM indicates +9.9 to + 10.1V

+10V test jack and negative test lead to SELF

TEST PWR RTN test jack

3-9